pg_dump streaming fails - PostgreSQL 9.2

["drum.lucas@xxxxxxxxx" <drum.lucas@xxxxxxxxx>]

Hi there!

I'm running this command: (Trying to copy a full DB (2TB) from a hot-standby server to a master (test) server)

ssh postgres@myslaveserver "/usr/pgsql-9.2/bin/pg_dump --exclude-table-data="" -—format=custom master_db" | /usr/pgsql-9.2/bin/pg_restore --dbname=master_db_temp --exit-on-error —-verbose

Then, after 3 GB I got this error:

pg_dump: Dumping the contents of table "invoices" failed: PQgetResult() failed.
pg_dump: Error message from server: ERROR:  canceling statement due to conflict with recovery
DETAIL:  User was holding a relation lock for too long.
pg_dump: The command was: COPY dm.invoices (invoice_id, format_version, ts_issue, ts_ack, customer_id, code, tag, account_data, customer_data, invoice_data, invoice_items_data) TO stdout;

I've tried the pg_dump command even with: "--no-unlogged-table-data" option, but it was unsuccessful (http://www.postgresql.org/message-id/E1TutDO-0001Hb-2v@xxxxxxxxxxxxxxxxxxxxxxx)

DB size: 2 TB

How can I solve the problem? What's going on? Thanks